Choke control for carburetors



Oct. 22, 1929. s. G. GARRETT CHOKE CONTROL FOR CARBURETORS Filed- Jan. 19. 1927 INVENTOR 8.6 Garrebt.

BY l0 ATTORNEY Patented Oct. 22, 1929 PATENT OFFICE STUART GRAYSON GARRETT, F TULSA, OKLAHOMA.

CHOKE CONTROL FOR CARIBURETORS Application tiled January 19, 1927. Serial No. 162,157.

This invention relates to choke controls for carburetors and is more particularly directed to the type of device described and claimed in m co-pending application, Serial No.

137,303, filed September 23,1926, now Patent An object of the invention is the provision of a device as is adapted to engage the usual actuating rod for the choke valve of an internal combustion engine which will permit readily actuation of the choke valve but which will cause the rod to travel slowly after release as the valve is opened by the usual sprmg- A further object of the invention is the provision of ade'vice asso ciatedwith the actuating rod for a choke valve and supported from the dash of an automobile which will prevent the choke valve from readily opening means being included in the device for timing the opening of the choke valve.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as shall define no material departure from the salient features of'the invention as exprressed in the appended claims. I

igure 1 is a side view in elevation of a form of the invention, I

Figure 2 is a modified form of the invention, and

Figure 3 is a control means.

Referring more particularly to the drawings, various forms of controlling means are shown which are operated through a plunger and air pressure, air being drawn into a cylinder so that when the spring tends to return the rod to its normal inoperative posltion air must be forced out by the action of a piston through a restricted opening in the cylinder carrying said piston. j

Referring more particularly to Figure 1 a dash 50 provides a bearing. for a reciprocat further modified form of the ing rod 51 which is adapted to actuate the.

choke valve. A piston rod 52 has a bent end 53, connected at 54:, to the rod 51. The other end of the rod is connected to a piston 55 in a cylinder 56. 57 is a guide for the choke rod. The outer end of the cylinder, as shown at 58, is secured to a vertical partition59 of the automobile.

A pipe 60 has one end 61 connected to the outer end of the cylinder 56 and its other end connected with a valve casing 62 carried by the dash 50. A valve stem 63 is connected to the valve in the casing 62 and is adapted to actuate the valve to permit a predetermined degree of fiow of air from the cylinder 56 through a short conduit 64. By properly manipulating the valve stem 63 the discharge of air through the pipe 64 may be readily controlled in order to time the movement of thepiston 55 when the rod 51 is actuated for opening the choke valve through the action of the spring 15.

Referring to Fig. 2 a similar form of control mechanism is shown in which a rod 65 is mounted for reciprocation in a bearing 66' 1 the rod 65.

The outer end of the cylinder 69 is connec'ted with a conduit 7 9 which in turn carries a valve casing in which is mounted a valve adapted to be operated by a valve stem 81. A discharge pipe 82 is connected with the casing 80. When the rod 65 is'moved in'the direction indicated by the arrow in Fig.1. jhe piston 7 5 draws in air through the conduit 82 or a check valve connected to the discharge end of the cylinder and when said rod is released and the choke valve is being opened the piston 7 5 must act against the air in the cylindeijjfit), the dischargeiof the air from pipe 82 being {controlled by the valve in the casing 80 so that the timing of the return reciprocating movement of the rod may be controlled at will.

A simplified form of the invention shown in Figs. 1 and 2 is illustrated in Fig. ,3 in which a cap is threaded onto an end of the cylinder 91. A plug 94 is threaded into the cap 90. A flange 92 screwed. tight against instrument board 93 holds the cylinder in place.

The plug is adapted to provide a bearing for a reciprocating rod 95. A piston 96 is mounted for movement in a cylinder 91 and is adapted to draw air through the conduit 97 and a valve 98 actuated by a threaded valve stem 99 operated through a finger piece 100 is adapted to controlthedischarge of air from the outer'end of the cylinder when the rod has been released to permit opening of the choke valve 14 through the actuation of the spring 15. The rod 95 has a reduced portion 101 extending through a packing gland 102 and a threaded nipple 103. The reduced portion 101 is adapted to be connected directly to an arm :20 of the bell crank lever 19, as shown in,Figures 1 and 2.

I claim 1. A choke control for carburetors comprising a slidably mounted rod, a choke valve, spring means for moving the valve to open position, a cylinder having an air vent for the admission and discharge of air, a piston slidably mounted in the cylinder, a piston rod having an arm bent at an angle to said rod, the bent arm being connected at its free end to thechoke rod, whereby reciprocation of the piston will inhale air into the cylinder when the choke valve is moved to closed position, said spring means tending to open the valve against the action of the piston on the air in the cylinder so that the rod will belslowly reciprocated for opening the choke va ve.

2. A choke control for carburetors compris ing a slidably mounted rod, a choke valve, spring means for moving the valve to open position, a cylinder having an air vent for the admission and discharge of air, a piston slidably mounted in the cylinder, a piston rod having an arm bent at an angle to said rod, the bent arm being connected at its free end tothe choke rod, whereby reciprocation of the piston will inhale air into the cylinder when the choke valve is moved to closed position, said spring means tending to open the valve against the action of the piston on the air in the cylinder so that the rod will be slowly reciprocated for opening the choke valve, and means for controlling the discharge of air from the cylinder for regulating the rate of movement of the rod.

STUART GRAYSON GARRETT. 

